Actually the surrogate can also donate their egg, essentially making it Kuhu and Abir's biological child if the mother's eggs are not viable. Same thing can happen to the man, the sperm won't be from the father, it can be from a bank or a relative.
Lol, I understand what surrogacy is. I understand how it works. I was talking about the specific situation that involves Yashoda and Devki. That is the context of my discussion.
Anyhoo, Mishti mentioned Yashoda and Devki. Not Devki and Dau bhaiyya's mother. That was an example of surrogacy.
If we are involving Kanhaji and how he is Devki's son and Yashoda brought him up then Kuhu and Abir's child makes no sense. Even dau bhaiyya is Vasudev and Devki's son. Not Vasudev and Rohini's. So in the context of Kanhaji, it would make sense that Abir and Mishti brought up a child that was Kunal and Kuhu's.